Randy, based on the following statement I am assuming they are suppose to be 15/20, 15/25 and 15/30 ARMs.
where the interest rate is fixed for 15 years then changes one time for the remaining
I have never seen this product but based on the terms your subsequent payment/rate change would be 20 years, 25 years and 30 years. A 15/20 ARM is saying the rate is fixed for the first 15 years and then changes every 20 years thereafter.
Like Randy asked, how will the rate change be determined and are you truly wanting to offer a 15/20, 15/25 & 15/30 ARM? You may want to do some research for step-rate loans.
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The opinions expressed are mine and they are not to be taken as legal advice.